Added more ram but when i try to up frequency it crashes

[Articledan]

As title

Im trying to learn about this stuff so bear with me.

I had 2x8gb 3000 ddr4 crucial ballistix. I buy the same sticks, same manufacturer, frequency and voltage but the part no. is not the same and the timings are slightly different. They work fine but only run at 2400 and when i try to up the frequency and run memtest the pc crashes pretty quickly. The mobo is a b450 prime.
If i set the timings manually would that help or should i just leave it stock? Or is there something else? cheers

 

[Articledan]

I think so, i have tried have profile1 under the D.O.C.P menu, it shows 3000 freq and some timings, but that also crashes with memtest

 

[Articledan]

Yea ive set the voltage at 1.35
Ok ill give that a try, thanks u guys